Then, it turns north via Main Street, passing the Jacksonville Municipal Airport.

US 136 then leaves the concurrency just west of the Scott W. Lucas Bridge.

IL 40 ends at an intersection south of Mount Carroll.

In Warren, it then turns northwest before reaching the Wisconsin state line.

[7] By the late 1930s, a portion of IL 78 was moved onto a more direct route between Maples Mill and West Havana.

[9] The following historic and geographic sites can be enjoyed on Illinois Route 78, traveling from south to north: